Angular drill



P. F. HOLMGREN.

ANGULAR 'omu.

APPLICATION FILED 'IAY 29. I919.

Patented Aug. 16,1921.

2 SHEETS-SHEET l- INVENTOR ATTORNEY P. F. HOLMGREN.

ANGULAR DRILL.

APPLICATION FILED MAY 29, I919.

Patented Aug. 16, 1921.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

PER 1E. HOLMG-REN, OF BROOKLYN, NEW YORK.

ANGULAR DRILL.

Application filed May 29,

T 0 all whom it may concern Be it known that PER F. Homionnn, a citizen of the United States, and resident of Brooklyn city of New York, county of Kings, and State of New York, has invented certain new and useful Improvements in Angular Drills, of which the following is a specification.

This invention relates to an angular drilling device which may be used as an attachment for boring holes not readily accessible with the ordinary drilling devices.

The invention has for an object to provide a simple and compact device which can be used in places having a limited head room and also for boring holes in interior members of a structure, etc.

For further comprehension of the invention and of the objects and advantages thereof. reference will be had to the following description and accompanying drawings and to the appended claims in which the various novel features of the invention are more particularly set forth.

Figure 1 of the drawings is a plan view of one side of the feeding mechanism of a drilling device constructed according to my invention.

Fig. 2 is a vertical sectional view, on the line 2-2 of Fig. 1, showing the complete device.

Fig. 3 is a view, partly in side elevation and partly in section on the line 33 of Fig. 4. showing an attachment for driving the drill at different speeds.

Fig. dis a transverse section or end view on the line 4-4, of Fig. 8.

As here shown, my improved drilling device comprises a yoke 1 having a central boss 1 having a longitudinal opening .2 extending theret-hrough. A pair of bearing bushings 3 and 4: are positioned inthe opposite ends of the opening 2 in which is journaled a shaft 5. The inner end of shaft 5 is threaded and extends between the arms 1 and 1 the yoke 1 and has threaded thereon a bevel gear 6 against a shoulder which takes the end thrust against the bushing 4. This bevel gear 6 meshes with a second bevel gear '7 screw threaded on a spindle 8 which extends transversely across the end of the shaft 5 and is supported in bearings mounted in the arms 1 and 1 of the yoke 1.

A hollow sleeve 10 is threaded through the upper arm 1 of the yoke l and forms a bear- Specification of Letters Patent.

Patented Aug. 16,1921.

1919. Serial No. 300,684.

ing for the upper portion of the spindle 8. The sleeve 10 has an integral square-toothed ratchet wheel 11 on its upper end and is adapted to be rotated by means of a handle 12 carrying a pawl 19, which is held in position by means of two plates 14 and 15 fixed in opposite sides thereof, as by the screws 13. The forward ends of the plates 14: and 15 project beyond the end of the handle 12 and form bearings or supports for the handle 12, being positioned about the upper end of the sleeve 10 on opposite sides of the ratchet 11. as shown at 1 1 and 15.

The handle 12 is longitudinally slotted at its forward end, as at 18, to receive the pawl 19 which engages the ratchet wheel 11. The slot 18 terminates at its rear end in an enlarged opening 20 to accommodate a knurled head 21 on the pawl 19, which is provided to permit of manual withdrawal and adjustment of the pawl with relation to the ratchet. wheel. The rear end of the pawl 19 has a flattened portion 19 which holds the pawl against rotation when it engages in the slot 18 but by Withdrawing the pawl until the portion 19 is disengaged from the slot 18 the pawl may be rotated to cause it to face in the opposite direction when it is desired to give reverse rotation to the sleeve 10. The formation of the teeth on the ratchet wheel permit of engagement with the pawl to cause the ratchet wheel to be rotated in either direction as desired as the handle 12 is oscillated.

The pawl 19 is pressed into engagement with the ratchet wheel 11 by means of a coiled spring 23 surrounding a stem 24 on the inner end of the pawl 11, this spring hearing at one end in a socket 25 in the handle 12 communicating with the enlarged opening 20 the opposite end of the spring bearing against the head 21 of the pawl.

The upper end of the sleeve 10 is recessed to form a seat 26 adapted to receive a head 27 having a projecting centering point 28 adapted to bear against a suitable abutment, which will be explained more fully hereinafter.

The spindle 8 is provided with a recess 29 adapted to receive the shank of a drill in the usual manner, this recess being intersected by the slot 29 to receive a wedge for forcing the drill out.

Positioned on the lower end of the spindle 8 at the point where it passes through the power arm 1 of the yoke 1 is a flanged viated.

sleeve 31 which is held between the flange 33 at the lower end of the spindle 8 and the gear 7 forms a bearing in a flanged bushing 32 threaded into a suitable aperture in the arm 1*, as shown. 7

The sleeve 10 provides a bearing for the upper end of the drill spindle 8 and on account of its length permits the necessary longitudinal movement of the spindle therein for feeding the drill forward.

It will be noted that the use of keys, etc, is avoided in my construction and arrangementof the several parts of the device. The shaft 5 always revolves in the same direction and, consequently, I attach the bevel gears 6 and '7 by threading the same on their re spective mountings against a shoulder, which provides a very substantial and simple means of attachment, the advantages of which are obvious.

The manner of use of my improved device will be apparent from the foregoing description and drawing. The shaft 5 may be connected by means of a flexible shafting to a suitable source of power. When the drill is applied to the part to be drilled the sleeve 10 is rotated by movement of the handle 12 which operates the ratchet device to move it outwardly from its position as shown in the yoke 1 until the head 27 engages a suitable abutment, such as a parallel wall of the piece being drilled, and further operationthereof out of the yoke causes the advancement of the yoke and the spindle and drill carried thereby, feeding the drill forward into the piece.

The utility of my improved drilling device in work that cannot be reached with an ordinary drill will be apparent, the necessity of drilling first through outside walls and later plugging the same when inside walls onwebs are to be drilled being ob- In Figs. 3 and 4 Ishow an addition to the attachment whereby the drill may be driven at different speeds. The attachment as pre viously described remains the same except that a bearing sleeve 3, which ends flush with the rear end of the central boss 1, is

substituted for the bushing 3 of Fig 2 and the boss 1 has 'acircumferential flange 1 at its rear end. r y

To this flange 1 is secured a spaced plate 40, the flange and plate being preferably both of the outline shown in the end view, Fig. 4. The plate 40 may be secured to the flange 1 by means of the spacing bolts 41 havinmreduced ends 42 and 43 the ends 42 being threaded into the flange 1 and the ends 43 passing through the plate 40 and having nuts v44 threaded on their ends.

Upon the shaft 5 is keyed a gear 45, which is locatedbetween the plate 40 and flange 1, the shaft 5 passing through a suitable opening or bearing in theplate 40. This gear 45 meshes with an idler 46 (Fig. 4) loosely mounted upon a stud 47 fixed in the plate 40 and flange 1. This idler 46 meshes in turnwith a second pinion 48 rigidly fixed in any suitable manner on a second shaft 49, parallel to the shaft 5, and journaled in the plate 40 and flange 1, being held against longitudinal displacement by the pinion 48, these three gears, 45, 46 and 48, being located between the flange 1 and plate 40.

The shaft 49 is of the same size as the shaft 5 and is adapted to be attached to any source of driving power to which the shaft 5 may be fitted. It will be apparent that when the shaft .49 is connected to the source of power the drill will be driven at a reduced speed through the gears 48, 46 and 45. When a. higher speed is desired the source of power is connected directly to shaft 5, thus providing two different speeds without changing the speed of the driving power and by changing the size of the gears any desired range or difference of speed of the drill may be provided.

What I claim is:

1. A drilling device comprising a spindle adapted to carry a drill, a shaft extending at an angle to said spindle and operatively connected thereto, a yoke carrying saidshaft and spindle and forming an abutment and a support for the latter a sleeve freely surrounding said spindle and threaded into said yoke means carried by said sleeve adapted to engage an abutment for the drilling device, and means for rotating said sleeve.

2. A drilling device comprising a spindle adapted to carry a drill, a shaft extending at an angle to said spindle and operatively connected thereto, a yoke carrying said shaft and spindle, one arm of said yoke forming an abutment and a support for the spindle, a sleeve threaded into the other arm of said yoke and surrounding said spindle, said sleeve being adapted to have free longitudinal movement on said spindle, and a pawl and ratchet device for rotating said sleeve.

A drilling device comprising a yoke having a central boss, a shaft j ournaled therein, a gear upon said shaft, a drill s indle extending across the end of said s aft and supported in the arms of the yoke, a gear upon said spindle meshing with the gear upon the shaft, one of the arms of said yoke forming an abutment and support for the spindle, a sleeve threaded through the.

other arm of the yoke and freely surrounding said spindle, said sleeve having one end provided with an abutment head said sleeve being adapted to have free longitudinal movement on said spindle, and a ratchet and pawl device for rotating said sleeve.

4. A'drilling device comprising a spindle adapted to carry a drill, a shaft extending at an angle to said spindleand operatively connected thereto, a yoke carrying said shaft and spindle and forming a support for the latter, a second shaft carried by said yoke, each of said shafts being adapted for independent connection to a source of power, and a reducing gear connection between said shafts.

5. A drilling device comprising a spindle adapted to carry a drill, a shaft extending at an angle to said spindle and operatively connected thereto, a yoke carrying said shaft and spindle and forming a support for the latter, a plate spaced apart from the rear end of the yoke, a second shaft rotatably supported in said plate, each of said shafts extending rearwardly from said plate and adapted for independent connection to a source of power, a gear fixed upon the first shaft, a pinion fixed on the second shaft, and an idler gear meshing with said pinion and said first mentioned gear, said gears and pinion being located between the said plate and the rear end of the yoke.

Signed at Brooklyn, county of Kings and State of New York, this 26th day of May,

PER F. HOLMGREN. 

